The revision of the Pliocene Mogi flora, described by Nathorst (1883) and Florin (1920)
The revision of the Pliocene Mogi flora, described by Nathorst (1883) and Florin (1920)
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发表时间:
1976-09
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通讯作者:
T. Tanai
中科院分区:
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作者:
T. Tanai
The Mogi fiora, first described by Nathorst (1883) and then by Florin (i920), was based on the specimens collected by the Swedish Vega Expedition in 1879 near Nagasaki, Kyushu. The author reinvestigated all the original specimens, which are deposited in the Swedish Museum of Natural Kistory in Stockholm. These specimens are mostly well-preserved in the fine venation character, though they are leaf impressions. Through investigating them together with our additional specimens from the same locality, the author confirms 52 identifiable species, which are composed of 31 families and 40 genera. All of them are woody dicots excepting for Metasequoia, and are composed mostly of deciduous broad-leaved trees. ,Pkegus is most predominant in number of specimens, and Juglans, Ckerpinus, Zelkova, Liquidambar, Sorbus, PVisteria, Zanthoxylum, Acer, Styrax, Tilia and Diospyros are common. A few evergreens such as nex, Elaeocarpus and Symplocos are contained, although not common. A large proportion of the living species related to the fossil plants are inhabitants of the deciduous broad-leaved forests in central and western Japan at altitudes of 300 up to 800 meters. The comparison with the living forests concludes that the Mogi fiora probably ge,Ple,S,e¥t,g,thl,'9,W,e,E,i,i:ge,,Zg,?t,ltg' P.",i:ill,?,W.hZ`,,ft?fl';.ar,O.M.ihr,C8.a?`6Tli8.Caklga,t8,'2d.lga.`,eS, index of OO to -20. The piant-bearing sediments have no marine indications, and the age evaluation has been based principally on plant fossils. The age discussion concludes that the Mogi flora is Late Pliocene in age, based on the current systematic reinvestigation which forms the final chapter of this article.